jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/g1SATBCardTableModRefBS.cpp@15c5903cf9e1 (annotated)

src/share/vm/gc_implementation/g1/g1SATBCardTableModRefBS.cpp@15c5903cf9e1 (annotated)

src/share/vm/gc_implementation/g1/g1SATBCardTableModRefBS.cpp

Mon, 03 Aug 2009 12:59:30 -0700

author: johnc
date: Mon, 03 Aug 2009 12:59:30 -0700
changeset 1324: 15c5903cf9e1
parent 1280: df6caf649ff7
child 1752: d4197f8d516a
permissions: -rw-r--r--

6865703: G1: Parallelize hot card cache cleanup
Summary: Have the GC worker threads clear the hot card cache in parallel by having each worker thread claim a chunk of the card cache and process the cards in that chunk. The size of the chunks that each thread will claim is determined at VM initialization from the size of the card cache and the number of worker threads.
Reviewed-by: jmasa, tonyp

 /*
  * Copyright 2001-2007 Sun Microsystems, Inc.  All Rights Reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  * CA 95054 USA or visit www.sun.com if you need additional information or
  * have any questions.
  *
  */
 #include "incls/_precompiled.incl"
 #include "incls/_g1SATBCardTableModRefBS.cpp.incl"
 G1SATBCardTableModRefBS::G1SATBCardTableModRefBS(MemRegion whole_heap,
                                                  int max_covered_regions) :
     CardTableModRefBSForCTRS(whole_heap, max_covered_regions)
 {
   _kind = G1SATBCT;
 }
 void G1SATBCardTableModRefBS::enqueue(oop pre_val) {
   assert(pre_val->is_oop_or_null(true), "Error");
   if (!JavaThread::satb_mark_queue_set().active()) return;
   Thread* thr = Thread::current();
   if (thr->is_Java_thread()) {
     JavaThread* jt = (JavaThread*)thr;
     jt->satb_mark_queue().enqueue(pre_val);
   } else {
     MutexLocker x(Shared_SATB_Q_lock);
     JavaThread::satb_mark_queue_set().shared_satb_queue()->enqueue(pre_val);
   }
 }
 // When we know the current java thread:
 template <class T> void
 G1SATBCardTableModRefBS::write_ref_field_pre_static(T* field,
                                                     oop new_val,
                                                     JavaThread* jt) {
   if (!JavaThread::satb_mark_queue_set().active()) return;
   T heap_oop = oopDesc::load_heap_oop(field);
   if (!oopDesc::is_null(heap_oop)) {
     oop pre_val = oopDesc::decode_heap_oop_not_null(heap_oop);
     assert(pre_val->is_oop(true /* ignore mark word */), "Error");
     jt->satb_mark_queue().enqueue(pre_val);
   }
 }
 template <class T> void
 G1SATBCardTableModRefBS::write_ref_array_pre_work(T* dst, int count) {
   if (!JavaThread::satb_mark_queue_set().active()) return;
   T* elem_ptr = dst;
   for (int i = 0; i < count; i++, elem_ptr++) {
     T heap_oop = oopDesc::load_heap_oop(elem_ptr);
     if (!oopDesc::is_null(heap_oop)) {
       enqueue(oopDesc::decode_heap_oop_not_null(heap_oop));
     }
   }
 }
 G1SATBCardTableLoggingModRefBS::
 G1SATBCardTableLoggingModRefBS(MemRegion whole_heap,
                                int max_covered_regions) :
   G1SATBCardTableModRefBS(whole_heap, max_covered_regions),
   _dcqs(JavaThread::dirty_card_queue_set())
 {
   _kind = G1SATBCTLogging;
 }
 void
 G1SATBCardTableLoggingModRefBS::write_ref_field_work(void* field,
                                                      oop new_val) {
   jbyte* byte = byte_for(field);
   if (*byte != dirty_card) {
     *byte = dirty_card;
     Thread* thr = Thread::current();
     if (thr->is_Java_thread()) {
       JavaThread* jt = (JavaThread*)thr;
       jt->dirty_card_queue().enqueue(byte);
     } else {
       MutexLockerEx x(Shared_DirtyCardQ_lock,
                       Mutex::_no_safepoint_check_flag);
       _dcqs.shared_dirty_card_queue()->enqueue(byte);
     }
   }
 }
 void
 G1SATBCardTableLoggingModRefBS::write_ref_field_static(void* field,
                                                        oop new_val) {
   uintptr_t field_uint = (uintptr_t)field;
   uintptr_t new_val_uint = (uintptr_t)new_val;
   uintptr_t comb = field_uint ^ new_val_uint;
   comb = comb >> HeapRegion::LogOfHRGrainBytes;
   if (comb == 0) return;
   if (new_val == NULL) return;
   // Otherwise, log it.
   G1SATBCardTableLoggingModRefBS* g1_bs =
     (G1SATBCardTableLoggingModRefBS*)Universe::heap()->barrier_set();
   g1_bs->write_ref_field_work(field, new_val);
 }
 void
 G1SATBCardTableLoggingModRefBS::invalidate(MemRegion mr, bool whole_heap) {
   jbyte* byte = byte_for(mr.start());
   jbyte* last_byte = byte_for(mr.last());
   Thread* thr = Thread::current();
   if (whole_heap) {
     while (byte <= last_byte) {
       *byte = dirty_card;
       byte++;
     }
   } else {
     // Enqueue if necessary.
     if (thr->is_Java_thread()) {
       JavaThread* jt = (JavaThread*)thr;
       while (byte <= last_byte) {
         if (*byte != dirty_card) {
           *byte = dirty_card;
           jt->dirty_card_queue().enqueue(byte);
         }
         byte++;
       }
     } else {
       MutexLockerEx x(Shared_DirtyCardQ_lock,
                       Mutex::_no_safepoint_check_flag);
       while (byte <= last_byte) {
         if (*byte != dirty_card) {
           *byte = dirty_card;
           _dcqs.shared_dirty_card_queue()->enqueue(byte);
         }
         byte++;
       }
     }
   }
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/gc_implementation/g1/g1SATBCardTableModRefBS.cpp@15c5903cf9e1 (annotated)

src/share/vm/gc_implementation/g1/g1SATBCardTableModRefBS.cpp